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Littérature scientifique sur le sujet « Shell nanowire »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Shell nanowire"

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Chopra, Nitin, Yuan Li et Kuldeep Kumar. « Cobalt oxide-tungsten oxide nanowire heterostructures : Fabrication and characterization ». MRS Proceedings 1675 (2014) : 191–96. http://dx.doi.org/10.1557/opl.2014.863.

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ABSTRACTNanowire heterostructures comprised of cobalt oxide and tungsten oxide were fabricated in a core/shell configuration. This was achieved by sputter coating tungsten oxide shells on standing cobalt oxide nanowires on a substrate. To ensure the polycrystallinity of tungsten oxide shell, the nanowire heterostructures were subjected to post-sputtering annealing process. The cobalt oxide nanowires for this study were grown employing a thermal method via vapor-solid growth mechanism. The crystal structures, morphologies, dimensions, and phases at various growth stages of nanowire heterostructures were studied using high resolution electron microscopy, energy dispersive spectroscopy, and X-ray diffraction methods. The interfaces of these nanowire heterostructures were also studied and showed variation in the lattice spacing across the heterostructure diameter. Results indicated that the cobalt oxide nanowires survived multiple processing steps and resulted in stable heterostructure configurations. The investigation shows, for the first time, a dry processing route for the formation of such novel nanowire heterostructures.
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Lee, Sun Sook, Hyun Jin Kim, Taek-Mo Chung, Young Kuk Lee, Chang Gyoun Kim et Ki-Seok An. « Fabrication of Nanocomposite Based on ZnO Nanowire ». Journal of Nanoscience and Nanotechnology 8, no 9 (1 septembre 2008) : 4895–98. http://dx.doi.org/10.1166/jnn.2008.ic80.

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ZnO-NiO core–shell nanowires and Ni-ZnO nanoparticle–nanowire composites have been synthesized by atomic layer deposition (ALD) and H2 thermal reduction, respectively. Grown ZnO nanowires on Si substrates by vapor transport method were used as templates for the growth of NiO layers. In order to prevent interfacial interaction between deposited NiO and ZnO nanowires templates by the reaction at low temperature and to precisely control the thickness of NiO layer, ALD technique was suitably employed to form the ZnO-NiO core–shell nanowires. All surface area of ZnO nanowires was completely and uniformly covered by amorphous NiO layers at low temperature of 130 °C. The Ni-ZnO nanoparticle–nanowire composites were achieved by the thermal reduction of the ZnO-NiO core–shell nanowires at H2 atmosphere. The density of Ni nanoparticles on ZnO nanowires was roughly related to the pre-deposited NiO thickness and the inter-diffusion of Ni into the ZnO nanowire was not observed.
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Son, Kwang-Soo, Dong Hyun Lee, Jae-Woong Choung, Yong Bum Pyun, Won Il Park, Taeseup Song et Ungyu Paik. « Catalyst-free synthesis and cathodoluminescent properties of ZnO nanobranches on Si nanowire backbones ». Journal of Materials Research 23, no 12 (décembre 2008) : 3403–8. http://dx.doi.org/10.1557/jmr.2008.0400.

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We report the catalyst-free synthesis of ZnO nanobranches on Si nanowires using metalorganic chemical vapor deposition. The formation of single-crystalline ZnO nanobranches on Si nanowire backbones has been confirmed by lattice resolved transmission electron microscopy. Depending on the growth parameters, especially the growth temperature, the morphology and size of the ZnO nanobranches evolved from nanothorn-shaped (at 350 °C) to nanoneedle-shaped structures (at 500 °C). When the growth temperature was further increased to 800 °C, thin ZnO nanowire branches grew out of the Si nanowire backbones coated with thin ZnO shells, whereas no ZnO branch was formed on bare Si nanowires due to limited nucleation. The growth behavior was further exploited to fabricate ZnO/Si nanowire networks by growing the ZnO nanowires selectively on laterally aligned Si–ZnO core-shell nanowire arrays. In addition, cathodoluminescent properties of ZnO nanobranches on Si nanowire backbones are discussed with respect to position and size.
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VERMA, ASHWANI, BAHNIMAN GHOSH et AKSHAY KUMAR SALIMATH. « EFFECT OF ELECTRIC FIELD, TEMPERATURE AND CORE DIMENSIONS IN III–V COMPOUND CORE–SHELL NANOWIRES ». Nano 09, no 04 (juin 2014) : 1450051. http://dx.doi.org/10.1142/s1793292014500519.

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In this paper, we have used semiclassical Monte Carlo method to show the dependence of spin relaxation length in III–V compound semiconductor core–shell nanowires on different parameters such as lateral electric field, temperature and core dimensions. We have reported the simulation results for electric field in the range of 0.5–10 kV/cm, temperature in the range of 77–300 K and core length ranging from 2 nm to 8 nm. The spin relaxation mechanisms used in III–V compound semiconductor core–shell nanowire are D'yakonov–Perel (DP) relaxation and Elliott–Yafet (EY) relaxation. Depending upon the choice of materials for core and shell, nanowire forms two types of band structures. We have used InSb – GaSb core–shell nanowire and InSb – GaAs core–shell nanowire and nanowire formed by swapping the core and shell materials to show all the results.
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Liu, Liqing, Hui Wang, Dehao Wang, Yongtao Li, Xuemin He, Hongguang Zhang et Jianping Shen. « ZnO@TiO2 Core/Shell Nanowire Arrays with Different Thickness of TiO2 Shell for Dye-Sensitized Solar Cells ». Crystals 10, no 4 (21 avril 2020) : 325. http://dx.doi.org/10.3390/cryst10040325.

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The ZnO@TiO2 core/shell nanowire arrays with different thicknesses of the TiO2 shell were synthesized, through depositing TiO2 on the ZnO nanowire arrays using the pulsed laser deposition process. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show that these core/shell nanowires were homogeneously coated with TiO2 nanoparticles with high crystallinity, appearing to be a rather rough surface compared to pure ZnO nanowires. The efficiency of ZnO@TiO2 core/shell structure-based dye-sensitized solar cells (DSSCs) was improved compared with pure ZnO nanowires. This is mainly attributed to the enlarged internal surface area of the core/shell structures, which increases dye adsorption on the anode to improve the light harvest. In addition, the energy barrier which formed at the interface between ZnO and TiO2 promoted the charge separation and suppressed the carrier recombination. Furthermore, the efficiency of DSSCs was further improved by increasing the thickness of the TiO2 shell. This work shows an efficient method to achieve high power conversion efficiency in core/shell nanowire-based DSSCs.
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Shiave, Ali Imran, Ravi Pratap Singh Tomar, Ingrid Padilla Espinosa et Ram Mohan. « Deformation Mechanisms and Dislocations in Nickel–Cobalt Core–Shell Nanowires Under Uniaxial Tensile Loading—A Molecular Dynamics Modeling Analysis ». Advanced Science, Engineering and Medicine 11, no 12 (1 décembre 2019) : 1187–201. http://dx.doi.org/10.1166/asem.2019.2478.

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One-Dimensional nanostructures are of great importance due to their unique electrical, magnetic and mechanical properties. Because of the size constraints, it is impractical to obtain and understand their mechanical properties, deformation behavior and associated mechanisms experimentally, while atomistic computational modeling offers a viable approach. Several studies have focused on pure metallic and compound nanowires; however, investigations and data for core–shell nanowires is still very limited. Present work models and analyzes Nickel–Cobalt (Ni–Co) core–shell nanowire systems under uniaxial tensile loading via molecular dynamics (MD) modeling. Present studies and analysis focus on predictive mechanical properties as well as insights on deformation mechanisms and dislocations during uniaxial tensile loading. Further, pure Ni and Co nanowire systems of similar configurations are modeled, and compared to our findings of core–shell nanowire systems. Results indicate that crystal mismatch in the region of core–shell interface have a significant effect, and plays an important role in the deformation process. Evolution of dislocations during uniaxial tensile loading deformation process, following a dislocation extraction analysis are presented and discussed. Further investigations of the core–shell nanowire structures involved a systematic study on the effect of core size on the predicted mechanical properties. Results indicate that the yield strength and Young's modulus indicated a linear increase for nickel shell–cobalt core systems with a Cobalt core for increasing core sizes, while maintaining nearly similar volume, length, and outer diameter of the core–shell nanowire system. Cobalt shell–nickel core nanowire systems with nickel core however was found not to depict any such definitive characteristics.
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Azmy, Ilham, et Jun Wang. « Construction of Hierarchical CuCo2O4-Ni(OH)2 Core-Shell Nanowire Arrays for High-Performance Pseudocapacitors ». Aceh International Journal of Science and Technology 11, no 1 (30 avril 2022) : 85–95. http://dx.doi.org/10.13170/aijst.11.1.24181.

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The hierarchical CuCo2O4-Ni(OH)2 core-shell nanowire arrays on Ni foam were fabricated using facile and cost-effective two-step hydrothermal synthesis. The growth of CuCo2O4 nanowires was developed on Ni foam as the apposite basis of the conductive scaffold, and the ultrathin Ni(OH)2 nanowires were subsequently immobilized to form CuCo2O4-Ni(OH)2 core-shell nanowire arrays (NWAs). The prepared materials were further characterized in structural, morphological, and electrochemical properties. The obtained CuCo2O4-Ni(OH)2 pseudocapacitor electrode, incorporated by unique core-shell heterostructures nanowire arrays, exhibited great specific capacitance of 1201.67 F g-1 at 1 mA g-1, which is much higher than pristine CuCo2O4 nanowire of 638.89 F g-1 at 1 mA g-1. Simultaneously, it also has a high power density of 5.56 kW kg-1 at an energy density of 73.33 Wh kg-1 and good long-term cycling performance (~84 capacitance retention after 1000 cycles). The improved morphological and structural properties have substantiated the CuCo2O4-Ni(OH)2 core-shell nanowire arrays properties owing to higher surface active area and richer redox activity for boosting the electrochemical properties.
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Li, Xiaoxin, Xiaogan Li, Ning Chen, Xinye Li, Jianwei Zhang, Jun Yu, Jing Wang et Zhenan Tang. « CuO-In2O3Core-Shell Nanowire Based Chemical Gas Sensors ». Journal of Nanomaterials 2014 (2014) : 1–7. http://dx.doi.org/10.1155/2014/973156.

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The CuO-In2O3core-shell nanowire was fabricated by a two-step method. The CuO nanowire core (NWs) was firstly grown by the conventional thermal oxidation of Cu meshes at 500°C for 5 hours. Then, the CuO nanowires were immersed into the suspension of amorphous indium hydroxide deposited from the In(AC)3solution by ammonia. The CuO nanowires coated with In(OH)3were subsequently heated at 600°C to form the crystalline CuO-In2O3core-shell structure, with In2O3nanocrystals uniformly anchored on the CuO nanowires. The gas sensing properties of the formed CuO-In2O3core-shell nanowires were investigated by various reducing gases such as hydrogen, carbon monoxide, and propane at elevated temperature. The sensors using the CuO-In2O3nanowires show improved sensing performance to hydrogen and propane but a suppressed response to carbon monoxide, which could be attributed to the enhanced catalytic properties of CuO with the coated porous In2O3shell and the p-n junction formed at the core-shell interface.
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Kim, Jung Han, Seul Cham Kim, Do Hyun Kim, Kyu Hwan Oh, Woong-Ki Hong, Tae-Sung Bae et Hee-Suk Chung. « Fabrication and Characterization of ZnS/Diamond-Like Carbon Core-Shell Nanowires ». Journal of Nanomaterials 2016 (2016) : 1–6. http://dx.doi.org/10.1155/2016/4726868.

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We fabricated ZnS/diamond-like carbon (DLC) core-shell heterostructure nanowire using a simple two-step process: the vapor-liquid-solid method combined with radio frequency plasma enhanced chemical vapor deposition (rf PECVD). As a core nanowire, ZnS nanowires with face-centered cubic structure were synthesized with a sputtered Au thin film, which exhibit a length and a diameter of ~10 μm and ~30–120 nm . After rf PECVD for DLC coating, The length and width of the dense ZnS/DLC core-shell nanowires were a range of ~10 μm and 50–150 nm , respectively. In addition, ZnS/DLC core-shell nanowires were characterized with scanning transmission electron microscopy. From the results, the products have flat and uniform DLC coating layer on ZnS nanowire in spite of high residual stress induced by the high sp3fraction. To further understanding of the DLC coating layer, Raman spectroscopy was employed with ZnS/DLC core-shell nanowires, which reveals two Raman bands at 1550 cm−1(G peak) and 1330 cm−1(D peak). Finally, we investigated the optical properties from ultraviolet to infrared wavelength region using ultraviolet-visible (UV-Vis) and Fourier transform infrared (FT-IR) spectrometry. Related to optical properties, ZnS/DLC core-shell nanowires exhibit relatively lower absorbance and higher IR transmittance than that of ZnS nanowires.
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Monaico, Eduard V., Vadim Morari, Veaceslav V. Ursaki, Kornelius Nielsch et Ion M. Tiginyanu. « Core–Shell GaAs-Fe Nanowire Arrays : Fabrication Using Electrochemical Etching and Deposition and Study of Their Magnetic Properties ». Nanomaterials 12, no 9 (28 avril 2022) : 1506. http://dx.doi.org/10.3390/nano12091506.

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The preparation of GaAs nanowire templates with the cost-effective electrochemical etching of (001) and (111)B GaAs substrates in a 1 M HNO3 electrolyte is reported. The electrochemical etching resulted in the obtaining of GaAs nanowires with both perpendicular and parallel orientations with respect to the wafer surface. Core–shell GaAs-Fe nanowire arrays have been prepared by galvanostatic Fe deposition into these templates. The fabricated arrays have been investigated by means of scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM). The magnetic properties of the polycrystalline Fe nanotubes constituting the shells of the cylindrical structures, such as the saturation and remanence moment, squareness ratio, and coercivity, were analyzed in relation to previously reported data on ferromagnetic nanowires and nanotubes.
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Thèses sur le sujet "Shell nanowire"

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Connors, Benjamin James. « Simulation of current crowding mitigation in GaN core-shell nanowire led designs ». Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41206.

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Core-shell nanowire LEDs are light emitting devices which, due to a high aspect ratio, have low substrate sensitivity, allowing the possibility of low defect density GaN light emitting diodes. Current growth techniques and physical non-idealities make the production of high conductivity p-type GaN for the shell region of these devices difficult. Due to the structure of core-shell nanowires and the difference in conductivity between ntype and p-type GaN, the full junction area of a core-shell nanowire is not used efficiently. To address this problem, a series of possible doping profiles are applied to the core of a simulated device to determine effects on current crowding and overall device efficiency. With a simplified model it is shown that current crowding has a possible dependence on the doping in the core in regions other than those directly in contact with the shell. The device efficiency is found to be improved through the use of non-constant doping profiles in the core region with particularly large efficiency increases related to profiles which modify portions of the core not in contact with the shell
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Fickenscher, Melodie A. « Optical and Structural Characterization of Confined and Strained Core/Multi-Shell Semiconducting Nanowires ». University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1329936272.

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Küpers, Hanno. « Growth and properties of GaAs/(In,Ga)As core-shell nanowire arrays on Si ». Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19402.

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Diese Arbeit präsentiert Untersuchungen zum Wachstum von GaAs Nanodrähten (NWs) und (In,Ga)As Hüllen mittels Molekularstrahlepitaxie (MBE) mit sekundärem Fokus auf den optischen Eigenschaften solcher Kern-Hülle Strukturen. Das ortsselektive Wachstum von GaAs NWs auf mit Oxidmasken beschichteten Si Substraten wird untersucht, wobei der entscheidende Einfluss der Oberflächenpreparation auf die vertikale Ausbeute von NW Feldern aufgedeckt wird. Basierend auf diesen Ergebnissen wird ein zweistufiger Wachstumprozess präsentiert der es ermöglicht NWs mit dünner und gerade Morphologie zu erhalten ohne die vertikale Ausbeute zu verringern. Für die detaillierte Beschreibung der NW Form wird ein Wachstumsmo- dell entwickelt, das die Einflüsse der Veränderung der Tropfen Größe während des Wachstums sowie direktes des Wachstums auf den NW Seitenwänden umfassend beschreibt. Dieses Wachstumsmodell wird benutzt für die Vorhersage der NW Form über einen großen Parameterraum um geeignete Bedingungen für die Realisierung von erwünschten NW Formen und Dimensionen zu finden. Ausgehend von diesen NW Feldern werden die optimalen Parameter für das Wachstum von (In,Ga)As Hüllen untersucht und wir zeigen, dass die Anordnung der Materialquellen im MBE System die Materialqualität entscheidend beeinflusst. Die dreidimensionale Struktur der NWs in Kombination mit der Substratrotation und der Richtungsabhängigkeit der Materialflüsse in MBE resultieren in unterschiedlichen Flusssequenzen auf der NW Seitenfacette welche die Wachstumsdynamik und infolgedessen die Punktde- fektdichte bestimmen. An Proben mit optimaler (In,Ga)As Hülle und äußerer GaAs Hülle zeigen wir, dass thermionische Emission mit anschließender nichtstrahlender Rekombination auf der Oberfläche zu einem starken thermischen Verlöschen der Lumineszenz Intensität führt, welches durch das Hinzufügen einer AlAs Barrierenhülle zur äußeren Hüllenstruktur erfolgreich unterdrückt werden kann. Abschließend wird ein Prozess präsentiert der das ex-situ Tempern von NWs bei hohen Temperaturen ermöglicht, was in der Reduzierung von Inhomogenitäten in den (In,Ga)As Hüllenquantentöpfen führt und in beispiellosen optischen Eigenschaften resultiert.
This thesis presents an investigation of the growth of GaAs nanowires (NWs) and (In,Ga)As shells by molecular beam epitaxy (MBE) with a second focus on the optical properties of these core-shell structures. The selective-area growth of GaAs NWs on Si substrates covered by an oxide mask is investigated, revealing the crucial impact of the surface preparation on the vertical yield of NW arrays. Based on these results, a two-step growth approach is presented that enables the growth of thin and untapered NWs while maintaining the high vertical yield. For a detailed quantitative description of the NW shape evolution, a growth model is derived that comprehensively describes the NW shape resulting from changes of the droplet size during elongation and direct vapour-solid growth on the NW sidewalls. This growth model is used to predict the NW shape over a large parameter space to find suitable conditions for the realization of desired NW shapes and dimensions. Using these GaAs NW arrays as templates, the optimum parameters for the growth of (In,Ga)As shells are investigated and we show that the locations of the sources in the MBE system crucially affect the material quality. Here, the three-dimensional structure of the NWs in combination with the substrate rotation and the directionality of material fluxes in MBE results in different flux sequences on the NW sidefacets that determine the growth dynamics and hence, the point defect density. For GaAs NWs with optimum (In,Ga)As shell and outer GaAs shell, we demonstrate that thermionic emission with successive nonradiative recombination at the surface leads to a strong thermal quenching of the luminescence intensity, which is succesfully suppressed by the addition of an AlAs barrier shell to the outer shell structure. Finally, a process is presented that enables the ex-situ annealing of NWs at high temperatures resulting in the reduction of alloy inhomogeneities in the (In,Ga)As shell quantum wells and small emission linewidths.
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Alqarni, Fahad, et Fahad Dhafer Alqarni. « Study of Piezo-phototronic Effect on Type-II Heterojunction ZnO/ZnSe Core/Shell Nanowire Array ». ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2034.

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Yang, Li. « First-principles Calculations on the Electronic, Vibrational, and Optical Properties of Semiconductor Nanowires ». Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14133.

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The first part of my PhD work is about the lattice vibrations in silicon nanowires. First-principles calculations based on the linear response are performed to investigate the quantum confinement effect in lattice vibrations of silicon nanowires (SiNW). The radial breathing modes (RBM) are found in our calculations, which have a different size-dependent frequency shift compared with the optical modes. They are well explained by the elastic model. Finally, the relative activity of the Raman scattering in the smallest SiNW is calculated. The RBM can be clearly identified in the Raman spectrum, which can be used to estimate the size of nanowires in experiment. In the second part of my PhD work, we focus on the electron-hole pair (exciton) in semiconductor nanowires and its influence on the optical absorption spectra. First-principles calculations are performed for a hydrogen-passivated silicon nanowire with a diameter of 1.2 nm. Using plane wave and pseudopotentials, the quasiparticle states are calculated within the so-called GW approximation, and the electron-hole interaction is evaluated with the Bethe-Salpeter Equation (BSE). The enhanced excitonic effect is found in the absorption spectrum. The third part of my work is about the electronic structure in Si/Ge core-shell nanowires. The electronic band structure is studied with first-principles methods. Individual conduction and valence bands are found in the core part and the shell part, respectively. The band offsets are determined, which give rise to the spatial separation of electron and hole charge carriers in different regions of the nanowires. This allows for a novel-doping scheme that supplies the carriers into a separate region in order to avoid the scattering problem. This is the key factor to create high-speed devices. With the confinement effect, our results show important correction in the band offset compared with the bulk heterostructure. Finally, an optimum doping strategy is proposed based on our band-offset data.
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Klankowski, Steven Arnold. « Hybrid core-shell nanowire electrodes utilizing vertically aligned carbon nanofiber arrays for high-performance energy storage ». Diss., Kansas State University, 2015. http://hdl.handle.net/2097/27651.

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Doctor of Philosophy
Department of Chemistry
Jun Li
Nanostructured electrode materials for electrochemical energy storage systems have been shown to improve both rate performance and capacity retention, while allowing considerably longer cycling lifetime. The nano-architectures provide enhanced kinetics by means of larger surface area, higher porosity, better material interconnectivity, shorter diffusion lengths, and overall mechanical stability. Meanwhile, active materials that once were excluded from use due to bulk property issues are now being examined in new nanoarchitecture. Silicon was such a material, desired for its large lithium-ion storage capacity of 4,200 mAh g[superscript]-1 and low redox potential of 0.4 V vs. Li/Li[superscript]+; however, a ~300% volume expansion and increased resistivity upon lithiation limited its broader applications. In the first study, the silicon-coated vertically aligned carbon nanofiber (VACNF) array presents a unique core-shell nanowire (NW) architecture that demonstrates both good capacity and high rate performance. In follow-up, the Si-VACNFs NW electrode demonstrates enhanced power rate capabilities as it shows excellent storage capacity at high rates, attributed to the unique nanoneedle structure that high vacuum sputtering produces on the three-dimensional array. Following silicon’s success, titanium dioxide has been explored as an alternative highrate electrode material by utilizing the dual storage mechanisms of Li+ insertion and pseudocapacitance. The TiO[subscript]2-coated VACNFs shows improved electrochemical activity that delivers near theoretical capacity at larger currents due to shorter Li[superscript]+ diffusion lengths and highly effective electron transport. A unique cell is formed with the Si-coated and TiO[subscript]2-coated electrodes place counter to one another, creating the hybrid of lithium ion battery-pseudocapacitor that demonstrated both high power and high energy densities. The hybrid cell operates like a battery at lower current rates, achieving larger discharge capacity, while retaining one-third of that capacity as the current is raised by 100-fold. This showcases the VACNF arrays as a solid platform capable of assisting lithium active compounds to achieve high capacity at very high rates, comparable to modern supercapacitors. Lastly, manganese oxide is explored to demonstrate the high power rate performance that the VACNF array can provide by creating a supercapacitor that is highly effective in cycling at various high current rates, maintaining high-capacity and good cycling performance for thousands of cycles.
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Messinese, Danilo. « Morphological instability analysis of a misfit strained core-shell nanowire for the growth of quantum dots ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7159/.

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Nell'ambito delle nanostrutture, un ruolo primario è svolto dai punti quantici. In questo lavoro siamo interessati all'analisi teorica del processo di creazione dei punti quantici: esso può avvenire per eteroepitassia, in particolare secondo il metodo studiato da Stranski-Krastanov. Un film di Germanio viene depositato su un substrato di Silicio in modo coerente, cioè senza dislocazioni, e, a causa del misfit tra le maglie dei due materiali, c'è un accumulo di energia elastica nel film. A una certa altezza critica questa energia del film può essere ridotta se il film si organizza in isole (punti quantici), dove la tensione può essere rilassata lateralmente. L'altezza critica dipende dai moduli di Young (E, υ), dal misfit tra le maglie (m) e dalla tensione superficiali (γ). Il trasporto di materiale nel film è portato avanti per diffusione superficiale. Il punto focale nell'analisi delle instabilità indotte dal misfit tra le maglie dei materiali è la ricerca delle caratteristiche che individuano il modo di crescita più rapido dei punti quantici. In questo lavoro siamo interessati ad un caso particolare: la crescita di punti quantici non su una superficie piana ma sulla superficie di un nanofilo quantico a geometria cilindrica. L'analisi delle instabilità viene condotta risolvendo le equazioni all'equilibrio: a tal fine sono state calcolate le distribuzioni del tensore delle deformazioni e degli sforzo di un nanofilo core-shell con una superficie perturbata al primo ordine rispetto all'ampiezza della perturbazione. L'analisi è stata condotta con particolari condizioni al contorno ed ipotesi geometriche, e diverse scelte dello stato di riferimento del campo degli spostamenti. Risolto il problema elastico, è stata studiata l'equazione dinamica di evoluzione descrivente la diffusione di superficie. Il risultato dell'analisi di instabilità è il tasso di crescita in funzione del numero d'onda q, con diversi valori del raggio del core, spessore dello shell e modo normale n, al fine di trovare il più veloce modo di crescita della perturbazione.
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Day, Robert Watson. « Crystal Growth on One-Dimensional Substrates : Plateau-Rayleigh Crystal Growth and Other Opportunities for Core/Shell Nanowire Synthesis ». Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17464133.

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Nanowires hold significant promise for both fundamental studies and technological applications ranging from energy conversion to electronics to biological sensing. The detailed understanding of nanowire synthesis and the realization of new synthetic approaches have enabled precise control over their size, morphology, and composition, and, consequently, their material properties. While much of the work on synthesis in the literature relates to axial nanowire growth, where growth proceeds in the direction of its long axis, this thesis has focused on probing the unique opportunities of shell growth, where material deposits radially around a nanowire core. To this end, I will show, first, that faceted Si core/shell nanowires can be synthesized with embedded pn junctions and that these structures can function as efficient photovoltaic devices with enhanced light absorption properties distinct from bulk Si devices. Second, through choice of reactants and reaction conditions used for shell growth, we demonstrate fine control over the size and morphology of these nanowires, which, in turn, drastically enhances their light absorption at particular wavelengths. Finally, we report for the first time a growth phenomenon that is unique to one-dimensional materials and which combines the underlying physics of the Plateau-Rayleigh instability with crystal growth. By exploiting this phenomenon, which we term Plateau-Rayleigh crystal growth, we demonstrate the growth of periodic shells on one-dimensional substrates. Specifically, we show that for conditions near the Plateau-Rayleigh instability the deposition of Si onto uniform-diameter Si cores, Ge onto Ge cores, and Ge onto Si cores can generate diameter-modulated core/shell nanowires. Rational control of deposition conditions enabled tuning of distinct morphological features, including diameter-modulation periodicity, amplitude and cross-sectional anisotropy. More generally, Plateau-Rayleigh crystal growth highlights the opportunities in understanding the thermodynamics and kinetics unique to crystal growth on nanowires and other low dimensional systems.
Chemistry and Chemical Biology
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Küpers, Hanno [Verfasser], Henning [Gutachter] Riechert, Christoph [Gutachter] Koch et Stefano [Gutachter] Sanguinetti. « Growth and properties of GaAs/(In,Ga)As core-shell nanowire arrays on Si / Hanno Küpers ; Gutachter : Henning Riechert, Christoph Koch, Stefano Sanguinetti ». Berlin : Humboldt-Universität zu Berlin, 2018. http://d-nb.info/1185578552/34.

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Sahu, Gayatri. « Investigating the Electron Transport and Light Scattering Enhancement in Radial Core-Shell Metal-Metal Oxide Novel 3D Nanoarchitectures for Dye Sensitized Solar Cells ». ScholarWorks@UNO, 2012. http://scholarworks.uno.edu/td/1478.

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Dye-sensitized solar cells (DSSCs) have attained considerable attention during the last decade because of the potential of becoming a low cost alternative to silicon based solar cells. Electron transport is one of the prominent processes in the cell and it is further a complex process because the transport medium is a mesoporous film. The gaps in the pores are completely filled by an electrolyte with high ionic strength, resulting in electron-ion interactions. Therefore, the electron transport in these so called state-of-the-art systems has a practical limit because of the low electron diffusion coefficient (Dn) in this mesoporous film photoanode. This work focuses on the influence of the advanced core-shell nanoarchitecture geometry on electron transport and also on the influence of electron-ion interactions. In order to achieve the proposed goals, DSSCs based on ordered, highly aligned, 3D radial core-shell Au-TiO2 hybrid nanowire arrays were fabricated, using three different approaches. J-V, IPCE, and EIS characteristics were studied. The efficiency, light scattering and charge transport properties of the core-shell nanowire based devices were compared to TiO2 nanotube as well as TiO2 mesoporous film based DSSCs. The Au nanowires inside the crystalline TiO2 anatase nanoshell provided a direct conduction path from the TiO2 shell to the TCO substrate and improved transport of electrons between the TiO2 and the TCO. The optical effects were studied by IPCE measurement which demonstrated that Au-TiO2 nanowires showed an improved light harvesting efficiency, including at longer wavelengths where the sensitizer has weak absorption. The metal nanostructures could enhance the absorption in DSSCs by either scattering light enabling a longer optical path-length, localized surface plasmon resonance (LSPR) or by near-field coupling between the surface plasmon polariton (SPP) and the dye excited state. Rapid, radial electron collection is of practical significance because it should allow alternate redox shuttles that show relatively fast electron-interception dynamics to be utilized without significant sacrifice of photocurrent. A combination of improved electron transport and enhanced light harvesting capability make Au-TiO2 core-shell nanowire arrays a promising photoanode nanoarchitecture for improving photovoltaic efficiency while minimizing costs by allowing thinner devices that use less material in their construction.
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Livres sur le sujet "Shell nanowire"

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Narlikar, A. V. Small Superconductors—Introduction. Sous la direction de A. V. Narlikar. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780198738169.013.1.

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This article provides an overview of small superconductors, including some of the basic definitions, prominent characteristics, and important effects manifested by such materials. In particular, it discusses size effects, surface effects, electron-mean-free-path effects, phase slips, unusual vortex states, and proximity effects. The article first considers the two characteristic length scales of superconductors, namely the magnetic penetration depth and coherence length, before proceeding with an analysis of two size effects that account for how superconductivity responds when the bulk sample is made smaller and smaller in the nano range: the small size effects and the quantum size effects. It then examines other phenomena associated with small superconductors such as quantum fluctuations, Anderson limit, parity and shell effects, along with the behaviour of nanowires and ultra-thin fims. It also describes some of the experimental techniques commonly used in the synthesis of small superconductors.
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Chapitres de livres sur le sujet "Shell nanowire"

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Hazra, Purnima, et S. Jit. « Electrical Characteristics of Si/ZnO Core–Shell Nanowire Heterojunction Diode ». Dans Physics of Semiconductor Devices, 673–75. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03002-9_173.

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Palutkiewicz, Tomasz, Maciej Wołoszyn et Bartłomiej J. Spisak. « Simulations of Transport Characteristics of Core-Shell Nanowire Transistors with Electrostatic All-Around Gate ». Dans Advances in Intelligent Systems and Computing, 233–41. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-44260-0_14.

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Chou, Yi-Chia, et King-Ning Tu. « Core-Shell Effect on Nucleation and Growth of Epitaxial Silicide in Nanowire of Silicon ». Dans One-Dimensional Nanostructures, 105–17. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118310342.ch5.

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Yanson, A. I., I. K. Yanson et J. M. Ruitenbeek. « Shell-Effects in Heavy Alkali-Metal Nanowires ». Dans Molecular Nanowires and Other Quantum Objects, 243–54. Dordrecht : Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2093-3_22.

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Yanson, A. I., I. K. Yanson et J. M. van Ruitenbeek. « Observation of Shell Structure in Sodium Nanowires ». Dans Statistical and Dynamical Aspects of Mesoscopic Systems, 305. Berlin, Heidelberg : Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-45557-4_24.

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Proenca, Mariana P., et João Ventura. « Exchange Bias in Core–Shell Nanowires and Nanotubes ». Dans Exchange Bias, 233–74. Boca Raton, FL : CRC Press, Taylor & Francis Group, [2018] | : CRC Press, 2017. http://dx.doi.org/10.1201/9781351228459-9.

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Sarikurt, Sevil, Cem Sevik, Alper Kinaci, Justin B. Haskins et Tahir Cagin. « Tailoring Thermal Conductivity of Ge/Si Core-Shell Nanowires ». Dans TMS Middle East - Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015), 433–40. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119090427.ch46.

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Sarikurt, Sevil, Cem Sevik, Alper Kinaci, Justin B. Haskins et Tahir Cagin. « Tailoring Thermal Conductivity of Ge/Si Core-Shell Nanowires ». Dans Proceedings of the TMS Middle East — Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015), 433–40. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48766-3_46.

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Ozel, Tuncay. « Hybrid Semiconductor Core-Shell Nanowires with Tunable Plasmonic Nanoantennas ». Dans Coaxial Lithography, 27–41. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45414-6_3.

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Wang, Rui, Jian Sun, Russell S. Deacon et Koji Ishibashi. « Ge/Si Core–Shell Nanowires for Hybrid Quantum Systems ». Dans Quantum Science and Technology, 165–95. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-6679-7_8.

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Actes de conférences sur le sujet "Shell nanowire"

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Castillo, Eduardo, Sadia Choudhury, Hyun Woo Shim, Jaron Kuppers, Hanchen Huang et Diana-Andra Borca-Tasciuc. « Thermal Characterization of Silicon Carbide Nanowire Films ». Dans ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67321.

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This paper reports on thermal characterization of SiC nanowire films on alumina substrate. The SiC nanowires films were synthesized via carbothermal reduction by thermal evaporation of silica and graphite powders using a high temperature alumina tube furnace. Structural characterization showed that nanowires have a core-shell structure, with a core of single crystal SiC of ∼50 nm in diameter and an amorphous shell of silicon oxide of ∼10 nm in thickness. Prior thermal measurements as-deposited SiC nanowires were compacted into more dense films via capillary coalescence. The effective thermal conductivity in the direction perpendicular to the film was determined employing a steady-state experimental method in conjunction with one-dimensional heat transfer modeling. Preliminary results suggest that these films have a very low thermal conductivity, in the range of 0.1W/mK. The low thermal conductivity may be due to intrinsic structure of the nanowire film such as porosity and large number of interfaces between the SiC nanowire core and its outer oxide layer as well as thermal contact resistance at nanowires junctions.
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Yang, Ronggui, Gang Chen et Mildred S. Dresselhaus. « Thermal Conductivity of Core-Shell Nanostructures : From Nanowires to Nanocomposites ». Dans ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72198.

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Core-shell heterostructures could potentially become the building blocks of nanotechnology for electronic and optoelectronic applications. The increased surface or interface area will decrease the thermal conductivity of such nanostructures and impose challenges for the thermal management such devices. In the mean time, the decreased thermal conductivity might benefit the thermoelectric conversion efficiency. In this paper, a generic model is established to study phonon transport in core-shell nanowire structures in the longitudinal direction using the phonon Boltzmann equation. The model can be used to simulate a variety of nanostructures, including nanowires and nanocomposites by changing some of the input parameters. We first report the dependence of the thermal conductivity on the surface conditions and the core-shell geometry for silicon core - germanium shell and tubular silicon nanowires. When the scattering at the outer shell surface in the generic model is assumed to be totally specular, the core-shell nanostructure resembles a simulation unit cell of periodic two-dimensional (2-D) nanocomposites. Thermal conductivity of nanowire composites and cylindrical nanoporous material in longitudinal direction is thus predicted as a function of the size of the nanowires and nanopores, and the volumetric fraction of the constituent materials. Results of this study can be used to direct the development of high efficiency thermoelectric materials.
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Liborius, Lisa, Jan Bieniek, Andreas Nagelein, Franz-Josef Tegude, Artur Poloczek et Nils Weimann. « n-doped InGaP Nanowire Shells in Core-Shell pn-junctions ». Dans 2019 Compound Semiconductor Week (CSW). IEEE, 2019. http://dx.doi.org/10.1109/iciprm.2019.8819134.

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He, Jin, Lining Zhang, Xiangyu Zhang, Wen Wu, Wenping Wang, Miaomiao Ma, Yun Ye et Mansun Chan. « Research progress on core-shell nanowire FETs ». Dans 2014 IEEE 12th International Conference on Solid -State and Integrated Circuit Technology (ICSICT). IEEE, 2014. http://dx.doi.org/10.1109/icsict.2014.7021497.

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Li, Fajun, Ziyuan Li, Liying Tan, Jing Ma, Lan Fu, Hark Hoe Tan et Chennupati Jagadish. « GaAs/AlGaAs core-shell ensemble nanowire photodetectors ». Dans CLEO : QELS_Fundamental Science. Washington, D.C. : OSA, 2017. http://dx.doi.org/10.1364/cleo_qels.2017.fm2h.6.

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Zhang, Lining, Jin He, Chenyue Ma, Xingye Zhou, Wei Bian, Lin Li et Mansun Chan. « An oxide/silicon core/shell nanowire FET ». Dans 2011 IEEE 11th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2011. http://dx.doi.org/10.1109/nano.2011.6144306.

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Wang, Zhihuan, Pouya Dianat, Kiana Montazeri, Baris Taskin, Marc Currie, Paola Prete, Nico Lovergine et Bahram Nabet. « A Core-Shell Nanowire Platform for Silicon Photonics ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2017. http://dx.doi.org/10.1364/fio.2017.jw4a.45.

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Manning, Hugh G., Subhajit Biswas, Shailja Kumar, Justin D. Holmes et John J. Boland. « Neuromorphic- Inspired Behaviour in Core-Shell Nanowire Networks ». Dans 2018 IEEE 18th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2018. http://dx.doi.org/10.1109/nano.2018.8626353.

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Zhu, Jia, Yueqing Xu, Qi Wang et Yi Cui. « Amorphous silicon core-shell nanowire Schottky solar cells ». Dans 2010 35th IEEE Photovoltaic Specialists Conference (PVSC). IEEE, 2010. http://dx.doi.org/10.1109/pvsc.2010.5616752.

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Wu, Hue-Min, et Jing-Yuan Chang. « Heterojunction luminescence of GaN/AlN core-shell nanowire ». Dans 2011 IEEE 4th International Nanoelectronics Conference (INEC). IEEE, 2011. http://dx.doi.org/10.1109/inec.2011.5991706.

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Rapports d'organisations sur le sujet "Shell nanowire"

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Wierer, Jonathan J. ,. Jr, Daniel David Koleske, Stephen Roger Lee, George T. Wang et Qiming Li. III-nitride core-shell nanowire arrayed solar cells. Office of Scientific and Technical Information (OSTI), septembre 2012. http://dx.doi.org/10.2172/1051734.

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Lee, Suhyun. The Optimized Synthesis of Copper Nanowire for High-quality and Fabrication of Core-Shell Nanowire. Portland State University Library, janvier 2000. http://dx.doi.org/10.15760/etd.7259.

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Krylyuk, Sergiy, Ratan Debnath, JongYoon Ha, Albert V. Davydov, Matthew King et Abhishek Motayed. Study of Charge Transport in Vertically Aligned Nitride Nanowire Based Core Shell P-I-N Junctions. Fort Belvoir, VA : Defense Technical Information Center, juillet 2016. http://dx.doi.org/10.21236/ad1011801.

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Baowen, Li. Managing Phonon Transport by Core/Shell Nanowires. Fort Belvoir, VA : Defense Technical Information Center, novembre 2012. http://dx.doi.org/10.21236/ada570448.

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